22. d4h4  22... a5a4 [%c_effect a4;square;a4;type;Inaccuracy;persistent;true] 23. a2a3 It's understandable that Grischuk stops the pawn, although 23... g8f8 [%c_effect f8;square;f8;type;Mistake;persistent;true] 24. e2d4 